More Accurate Audio Bass Passive Radiator Auxiliary Rubber Diaphragm Bass Diaphragm High Elasticity Radiator 52mm Diaphragm Diaphragm Radiator Speakers Vibration Film 52mm 2 inch square fake speaker with excellent resistance and strong effect is widely used for DIY wireless speakers to strengthen bass It must be a closed box Specifications: Material: Rubber +Iron Color: Black Size: Approx. 52x52mm/2.05"x2.05" Package Content: 2x Bass Passive Radiator Note: Due to manual measurement, please allow 1-2cm discrepancy Please do not mind before ordering. Due to the difference between different monitors, the picture may not reflect the actual color of the item.